writeback: Add logging for slow writeback (exceeds sysctl_hung_task_timeout_secs)
When a writeback work lasts for sysctl_hung_task_timeout_secs, we want
to identify that there are tasks waiting for a long time-this helps us
pinpoint potential issues.
Additionally, recording the starting jiffies is useful when debugging a
crashed vmcore.
Signed-off-by: Julian Sun <sunjunchao@bytedance.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
projects / thirdparty / kernel / stable.git / commit
